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參數(shù)資料
| 型號： | MC80C52TXXX-12 |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CDIP40 |
| 文件頁數(shù)： | 35/83頁 |
| 文件大?。?/td> | 8336K |
| 代理商： | MC80C52TXXX-12 |
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32
8021G–AVR–03/11
ATmega329P/3290P
When this Oscillator is used as the chip clock, the Watchdog Oscillator will still be used for the
Watchdog Timer and for the Reset Time-out. For more information on the pre-programmed cali-
bration value, see the section ”Calibration Byte” on page 299.
Notes:
1. The device is shipped with this option selected.
2. The frequency ranges are preliminary values.
3. If 8MHz frequency exceeds the specification of the device (depends on V
CC), the CKDIV8
Fuse can be programmed in order to divide the internal frequency by 8.
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Note:
1. The device is shipped with this option selected
.
8.7
External Clock
To drive the device from an external clock source, XTAL1 should be driven as shown in Figure
8-3 on page 32. To run the device on an external clock, the CKSEL Fuses must be programmed
to “0000”.
Figure 8-3.
External Clock Drive Configuration
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Table 8-9.
Internal Calibrated RC Oscillator Operating Modes
Frequency Range(2) (MHz)
CKSEL3...0
7.3 - 8.1
0010
Table 8-10.
Start-up times for the internal calibrated RC Oscillator clock selection
Power Conditions
Start-up Time from Power-
down and Power-save
Additional Delay from
Reset (VCC = 5.0V)
SUT1...0
BOD enabled
6 CK
14CK
00
Fast rising power
6 CK
14CK + 4.1 ms
01
Slowly rising power
6 CK
14CK + 65 ms(1)
10
Reserved
11
Table 8-11.
Crystal Oscillator Clock Frequency
CKSEL3...0
Frequency Range
ATmega329P/3290P
0000
0 - 20MHz
NC
EXTERNAL
CLOCK
SIGNAL
XTAL2
XTAL1
GND
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